Decisive factors to performance of ternary recording code

The authors investigated the decisive factors affecting the performance of ternary codes in accordance with the NRZL rule, which are associated with the three-level recording waveform. They selected several mBnT codes and evaluated the bit error rate by computer simulation. The results clearly show that a DC-free property guarantees the improvement of the necessary signal-to-noise ratio and that larger code rate provides a greater capacity for noise suppression